I just watched the Pluralsight video on URL routing in ASP.NET MVC 3. I'm still a bit confused.

That image shows how my views are set up. I have a controller for each view. Perhaps I misunderstood something but when I did this I thought by adding the Portfolio view and controller instead of going to /home/portfolio it would just take me to /portfolio but it didn't. Now when I click on the portfolio link it takes me to /portfolio/portfolio.
Am I misunderstanding something about the way routing works in ASP.NET or am I just forgetting something?